BUG FIX: Shiny apps running as background jobs in RStudio [#183]

Author: HenrikBengtsson

DESCRIPTION

@@ -1,5 +1,5 @@
 Package: progressr
-Version: 0.16.0-9002
+Version: 0.16.0-9003
 Title: An Inclusive, Unifying API for Progress Updates
 Description: A minimal, unifying API for scripts and packages to report progress updates from anywhere including when using parallel processing.  The package is designed such that the developer can to focus on what progress should be reported on without having to worry about how to present it.  The end user has full control of how, where, and when to render these progress updates, e.g. in the terminal using utils::txtProgressBar(), cli::cli_progress_bar(), in a graphical user interface using utils::winProgressBar(), tcltk::tkProgressBar() or shiny::withProgress(), via the speakers using beepr::beep(), or on a file system via the size of a file. Anyone can add additional, customized, progression handlers. The 'progressr' package uses R's condition framework for signaling progress updated. Because of this, progress can be reported from almost anywhere in R, e.g. from classical for and while loops, from map-reduce API:s like the lapply() family of functions, 'purrr', 'plyr', and 'foreach'. It will also work with parallel processing via the 'future' framework, e.g. future.apply::future_lapply(), furrr::future_map(), and 'foreach' with 'doFuture'. The package is compatible with Shiny applications.
 Authors@R: c(person("Henrik", "Bengtsson",

NEWS.md

@@ -1,7 +1,11 @@
 # Version (development version)
 
- * ...
+## Bug Fixes
 
+ * Shiny apps running as background jobs in RStudio could fail with an
+   error "object 'RStudio.Version' of mode 'function' was not found".
+   This error occurred sporadically.
+   
 
 # Version 0.16.0 [2025-05-18]
 

R/options.R

@@ -263,4 +263,8 @@ update_package_options <- function(debug = FALSE) {
 
   ## However, not used
   update_package_option("global.handler", mode = "logical", debug = debug)
+
+  ## For RStudio users
+  update_package_option("rstudio.patch", mode = "logical", debug = debug)
 }
+

R/rstudio-console.R

@@ -2,12 +2,17 @@ get_rstudio_version <- local({
   .version <- NULL
   function() {
     if (is.null(.version)) {
-      if (!"tools:rstudio" %in% search()) {
-        .version <<- package_version("0.0")
-      } else {
+      .version <<- package_version("0.0")
+      if ("tools:rstudio" %in% search()) {
         envir <- as.environment("tools:rstudio")
-        RStudio.Version <- get("RStudio.Version", mode = "function", envir = envir, inherits = FALSE)
-        .version <<- RStudio.Version()[["version"]]
+        ## There are cases where 'tools:rstudio' exist, but there is no
+        ## RStudio.Version() function. See
+        ## https://github.com/futureverse/progressr/issues/183 for
+        ## an example. Not sure how that happens. /HB 2025-09-23
+        if (exists("RStudio.Version", mode = "function", envir = envir, inherits = FALSE)) {
+          RStudio.Version <- get("RStudio.Version", mode = "function", envir = envir, inherits = FALSE)
+          .version <<- RStudio.Version()[["version"]]
+        }
       }
     }
     .version